CROSS_COMPILE_SYSROOT=/opt/arm/gcc-linaro-7.5/arm-linux-gnueabihf/libc
ROOTFS=./sysrootlib
mkdir -p ${ROOTFS}/lib
cp ${CROSS_COMPILE_SYSROOT}/lib/ld-linux-armhf.so.3 ${ROOTFS}/lib/ 
cp ${CROSS_COMPILE_SYSROOT}/lib/libc.so.6 ${ROOTFS}/lib/ 
cp ${CROSS_COMPILE_SYSROOT}/lib/libm.so.6 ${ROOTFS}/lib/
